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Story summary
- Mitchell A. Gaff, 68, pleaded guilty to the murders of Judith Weaver and Susan Vesey in Washington State.
- Investigators linked him to the crimes via DNA from chewing gum collected during a ruse.
- Gaff is a diagnosed sexual sadist with a history of violent crimes, including rapes and assaults.
- Everett Mayor Cassie Franklin credited police for using DNA advancements to solve these cases.
- Gaff's sentencing is set for May 13.
